Easy turning:
On some corners there are numbers on the fence counting down to 1. If you brake/handbrake at 1 it will be much easier to turn.

Easy outrun challenge win:
If your going more than 60 miles an hour on the motorway, if you want to do a outrun challenge, you can bash into the back of them and they will go flying. You will only slow down a bit, but if you keep the acceleration up, you'll win within seconds